NEW: support to config ftp_folder for printer [P1P]

Change-Id: I6a3b2a67d2950e2c1c5267bb7c65d5594924caec
Signed-off-by: Stone Li <stone.li@bambulab.com>
(cherry picked from commit 176e505bcf5f48971302d9aff14e74b118eeafbe)

src/slic3r/GUI/Jobs/PrintJob.cpp

@@ -177,6 +177,7 @@ void PrintJob::process()
     }
 
     params.dev_id = m_dev_id;
+    params.ftp_folder = m_ftp_folder;
     //params.project_name = project_name;
     params.project_name = m_project_name;
     params.preset_name = wxGetApp().preset_bundle->prints.get_selected_preset_name();